Method and arrangement for trans



Oct. 6, 1942. B. LOEWE Re. 22,198

METHOD AND ARRANGEMENT FOR TRANSFERRING TELEPHONE CONVERSATIONS TO OTHER ELECTRICAL DEVICES Original FiledMarch 25, 1959 Reieeued Oct. 6, 1942 UNITED STATE METHOD AND ARRANGEMENT. FOR TRANS- FIJRRING TELEPHONE CONVERSATIONS TO OTHER ELECTRICAL DEVICES Bernhard Loewe, Yonkers, N. Y. Original No. 2,268,665, dated January 6, 1942, Se-

rial No. 264,083,March 25, 1939. Application ior reissue June 13, 1942, Serial No. 448,075

6 Claims. (Cl. 179-1) My invention relates to a method'oftransferring telephone conversations and alike to electri-' cal devices which are in no way directly connected with the telephone circuit. More particularly my invention is concerned with arrangements for the practical use of the said method.

I'found that there is a considerable dispersed field outside of regular telephone receivers in their neighborhood. The density of this field is not even all around the receiver. Very often it culminates on certain points of the front side of the receiver before the membrane, but sometimes it is stronger on the back side or at a side. It depends upon of what construction the receiver is. On putting on or more suitable formed coils in this field there will be induced considerable tensions in the coils which maybe provided with an iron core.

The principal object of my invention is'the use of this electrical field for transferring telephone conversations to other electrical devices such as other receivers or amplifiers for reproduction by a loudspeaker or by recording, or for transferring the said conversations to interomce communication circuits, etc. By using this new method according to my invention no conducting junction has to be made between the'telephone circuit and the coil circuit, thus avoiding any disturbance and reaction in the telephone. circuit which otherwise may occur.

Another object of my invention is to provide simple inexpensive and eflicient arrangements for picking up the dispersed field as described above.

Other objects and advantages of the invention will become apparent from the following description taken in connection with the accompanying drawing in which is: Fig. 1 a schematic circuit diagram according to the invention;

, Fig.- 2 a front view of an arrangement according to the invention after removing the cover irom the middle part;

Fig. 3 a sectional view across the same arrangement as shown in Fig. 2 taken in the direction AB, the arrangement being attached to a receiver-part of a so called French telephone, the

receiver partly shown in sectional view;

Fig. 4 a side view of another arrangement constructed according to toe invention;

Fig. 5 a view to the backside of still another arrangement according to the invention attached to the backside of a single earphone receiver;

Fig. 6 a side view of the same arrangement as shown in Fig. 5'.

vention, a receiver l which is connected with an ordinary telephone circuit by the wires 2 is placed opposite a pair of coils 3 in such a position, that the field starting from inside'the receiver may induce electrical tensions in the, coils 3. The coils are connected to each other in such a way that the tensions are added and the other ends of the windings of the coils are connected by the wires 4 with the input of an amplifier 5, the output of the latter being. connected with the speaker I by the wires 6. Any suitable amplifier and loudspeaker may be used and very good results are obtained by connecting the wires 4 with the input for phono-pickup of a regular radio set. The coils may be provided with an iron core and the wholev arrangement may be tunable around theaxis x-x for adjusting the coils in the most emcient position opposite the coils for the receiven The number of wire windings and V the resistance of the coil is largely variable and should be adapted to the connected circuit.

In Fig. 2 is shown an arrangement of two coih l2 and itput over an iron core of U-shape-ll and connected to each other'by the wire a. The other endsot the coils are connected with the inner conductor N and the shielding ll of a shielded cord IS. The eeils are fastened for instance by an insulating wax in a suitable formed cavity of the holder 8. The use of this holder may be best illustrated by the Fig. 3, which is a cross-section of Fig. 2 along the line A-B, and which shows hew the holder 8 fits over the receiver part It of a so called French telephone. The

holder I which may be made out of elastic and insulating material such as rubber, but may as well partly or on the whole consist of other material fits with his part 4| over the front part 42 of the receiver It. The holder 8 may be attached to the receiver in such a position that the axis of the receiver coils i8 and i9 coincides with the axis of the coils I2 and It. The holder 8 is provided with holes 9 so that the tone starting from the membrane 20 may pass through the holder 6 and any regular telephone conversation can be made even after attaching the arrangement to the teiephone receiver. I0 is a cover for the cavity which is brought in place after assembling the whole arrangement.

Another arrangement for more temporary attachment oi the coils to the telephone receiver is shown in Fig. 4 in which is 2| a support which holds a lever .24 movable in the Joint 32.

The other endof the lever is formed by two hooks 43 for instance a French telephone can be hanged on-by his receiver part. This end of the lever furthermore bears a .cylindrical arrangement 21 which contains the coils as above described, the terminals for connection the said coils with the circuit being 30 and ll. The cylindrlcal arrangement 21 tits in a sliced ring 2| so that it may be adjusted by turning and then fixed by pressing the sliced ends of the ring together by means of the screw 28. The weight or the telephone 22 presses the lever against the movable pin 25 which then will be moved downwards. This movement can be used for switching on a circuit attached by the cord 26 for similar purposes. After removing the telephone from the hook a spring' presses the pin 25 and ,the lever upwards and releases the pressure from the switch.

In Fig. is shown the backside of an earphone 33 to which an arrangement 34 is attached by means of the elastic clasps 35, It, and IL, The cylindrical part II contains the coils. The ends of their windings are connected to each other and with the conductors of a shielded cord 39 in the usual manner. 40 is cord connecting the earphone I3 withv the telephone circuit.

It will be understood that various modifications within the conception of those skilled in the art are possible without departing from the iii ing, in combination, a U-shaped iron core, two coils mounted on said core and connected in series, means for securing a desirable-distance between said core and between the diaphragm of a telephone and a cap adapted to attach said core and coils elastically to the earpiece of said telephone, said cap having a substantially smooth unobstructed front surface, and all said members being combined into a self contained unit free of relative mobility and relative vibration to, each other.

4. Coupling device for inductive coupling of a telephone circuit with another circuit comprisspirit of my invention or the scope of the claims.

What I claim is:

1. Coupling devicefor inductive coupling of a telephone circuit with another circuit, comprising two series connected coils mounted on a U- shaped iron core, with the free ends of the coils connected preferably to a shielded cord, and with the core and the coils mounted thereon covered with non-conducting material and tightly sealed in a suitably formed cavity of a holder, the latter being made of elastic, non-conducting material and of such a shape, that its inner part flts over the earpiece of a telephone receiver, holding hereby the core and the coils thereon in proper position to the corresponding parts of the telephone receiver, the outer parts of the holder having the shape of an earpiece, and the wall between the inner and the outer part of the holder having holes.

2. Coupling device for inductive coupling of a telephone circuit with another circuit comprising, in combination, a U-shaped iron core, two coils mounted on said core and connected in series, and an elastic cap adapted to attach said core and coils to the earpiece of a telephone, the

, filling holding ing, in combination, a U-shaped iron core, two coils mounted on said core and connected in series, a cap adapted to attach said core and coils elastically to the earpiece of a telephone, and a central boss connected with said cap and forming a casing for said core and said coils, said boss separating said core and coils from the surrounding space in said cap and protecting them from injury from the open end of the cap in the detached condition of the latter.

5. Coupling device for inductive coupling of a telephone circuit with another circuit comprising, in combination, a' U-shaped iron core, two coils mounted on said core and connected in series, a cap adapted to attach said core and coils elastically to the earpiece of a telephone, a central boss connected with said cap and forming a casing for said core and said coils, said boss separating said core and coils from the surrounding space in ,said cap and protecting them from injury from the open end of the cap in the detached condition of the latter, and a. cement said core and coils in place in said boss. r

6. Coupling device for inductive coupling of'a telephone circuit with another circuit compris ing, in combination, a U-shaped iron core, two 'coils mounted on said core and connected in se-- ries, a rubber cap adapted to attach said core and coils elastically to the earpiece of a telephone,

and a central rubber boss integral with said cap and forming a casing for said core andsald coils, said boss separating said core and coils from the surrounding space in said cap and protecting them from injury from the open end of the cap in the detached condition of the latter.

BERNHARD LOEWE. 

